You may want to use the bps MIB's instead, such as IfStatsInBitsPerSec and IfStatsOutBitsPerSec. They would be under your vendor's MIB's. They work a lot better and don't wrap. I'm graphing multi-gigabit speeds no problem with them.
From: rick.jon...@hp.com To: rrd-users@lists.oetiker.ch Date: Tue, 14 Jun 2011 16:52:35 -0700 Subject: [rrd-users] bug in dealing with counter wrap in 1.4.3? At the moment, I am working with a device that should be using 64-bit wide counters in its report of octets via sFlow, but is only using 32 bits. Through this device I am sending a constant stream of netperf UDP_STREAM reporting a very steady 961 Mbit/s (and change, occasionally it will report 960.97 Mbit/s) so I suspect the device is being driven at link-rate. It is reporting these counters every 30 seconds, link-rate 1 GbE networking should wrap a 32-bit octet counter in ~40 seconds, so I believe I should never have more than one counter wrap per sampling interval. I am using a step size of one second. I was seeing large gaps in my graphs so I isolated the one value I was looking at from the rest, and captured some data from the device and fed it to an rrd created with: rrdtool create test.rrd --start 1308092201 --step 1 DS:foo:DERIVE:60:0:U RRA:AVERAGE:0.5:1:86400 fed it with the data I extracted from a tcpdump trace of the sFlow PDUs: raj@tardy:~/rrdbug$ cat update.sh rrdtool update test.rrd 1308092202.610:441241050 rrdtool update test.rrd 1308092232.610:4141751743 rrdtool update test.rrd 1308092262.609:3546818048 rrdtool update test.rrd 1308092292.609:2952516367 rrdtool update test.rrd 1308092322.609:2357287750 rrdtool update test.rrd 1308092352.609:1762735341 rrdtool update test.rrd 1308092382.609:1168026482 rrdtool update test.rrd 1308092412.609:573080395 rrdtool update test.rrd 1308092442.609:4273817690 rrdtool update test.rrd 1308092472.608:3678028081 rrdtool update test.rrd 1308092502.608:3082845004 rrdtool update test.rrd 1308092532.608:2488508409 rrdtool update test.rrd 1308092562.608:1892937812 rrdtool update test.rrd 1308092592.608:1298202985 rrdtool update test.rrd 1308092622.608:703006246 rrdtool update test.rrd 1308092652.608:107385307 rrdtool update test.rrd 1308092682.607:3807847414 rrdtool update test.rrd 1308092712.607:3212758463 rrdtool update test.rrd 1308092742.607:2617461450 rrdtool update test.rrd 1308092772.607:2022995653 rrdtool update test.rrd 1308092802.607:1428422068 rrdtool update test.rrd 1308092832.607:833109777 rrdtool update test.rrd 1308092862.607:239454268 rrdtool update test.rrd 1308092892.607:3939282433 rrdtool update test.rrd 1308092922.606:3343962564 rrdtool update test.rrd 1308092952.606:2749615279 rrdtool update test.rrd 1308092982.606:2154394252 rrdtool update test.rrd 1308093012.606:1559964909 rrdtool update test.rrd 1308093042.606:965307748 rrdtool update test.rrd 1308093072.606:370349517 rrdtool update test.rrd 1308093102.606:4070642890 rrdtool update test.rrd 1308093132.606:3475575191 rrdtool update test.rrd 1308093162.605:2881212866 rrdtool update test.rrd 1308093192.605:2286174031 rrdtool update test.rrd 1308093222.605:1691311682 rrdtool update test.rrd 1308093252.605:1097016331 rrdtool update test.rrd 1308093282.605:502274162 rrdtool update test.rrd 1308093312.605:4201809009 rrdtool update test.rrd 1308093342.605:3606613788 rrdtool update test.rrd 1308093372.604:3012392733 rrdtool update test.rrd 1308093402.604:2417665658 and then graphed that: rrdtool graph graph.png --end 1308093373 --start 1308092202 -w 1000 -h 400 --step 1 -t "30 Second Counter Samples" -v "Octets/s" --full-size-mode DEF:bar=test.rrd:foo:AVERAGE LINE2:bar#FF0000 The resulting graph is attached. Is there perhaps some issue in the wrap code that results in the drop-outs? FWIW, I appear to see the same behaviour if I use COUNTER rather than DERIVE. rick jones _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
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